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I would clear the code and see if it returns. If the EGR valve is stuck open, it would make it buck or shutter. If the EGR valve is not functioning right, or clogged up, it will effect proformance. I would replace the EGR valve. I read that it's a common problem.

egr flow sensor A curcuit high input---p0406. replace exhaust gas recirculation valve.--EGR-- or clean out carbon from engine side. if this does not work by cleaning, replace egr valve. also check all wire connections.